Greedy type welcoming time to prepare snack (3,3)
I believe the answer is:
hot dog
'snack' is the definition.
(I've seen this before)
'greedy type welcoming time to prepare' is the wordplay.
'greedy type' becomes 'hog' (I can't justify this - if you can you should give a lot more credence to this answer).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'time' becomes 't' (abbreviation).
'to prepare' becomes 'do' (I've seen this in other clues).
't'+'do'='tdo'
'hog' placed around 'tdo' is 'HOT DOG'.
Can you help me to learn more?
(Other definitions for hot dog that I've seen before include "Long roll containing sausage" , "'Frankfurter in a bun (3,3)'" , "Sausage in breae roll" , "Sausage in a roll for feverish canine" , "Frankfurter in a roll" .)